carbon arc
discoloration
weatherometer, or
QUV
Water Absorption,
ASTM D 570
2.8, maximum
percentage by
168 hours, 75F
weight
Hardness, Shore A
ASTM D 2240
80, minimum
points
Permeability
ASTM E 96
1.0, Maximum
perms
Procedure E
20 mil thickness
]2.2.5
Coating Color
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NOTE: Select or insert required color for finish
coat. Delete remaining options.
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Coating layers shall be of distinguishably different color such that dry
film thickness of each layer of the completed application can be
determined. Finish coat shall be [white][off-white][light gray][gray][
].
2.3
PRIMER
Primers used shall be as required and recommended by the coating and spray
foam materials manufacturer for the substrate to be covered.
Rust-inhibiting primer shall be used for ferrous metal surfaces. Cut-back
asphalt primers are prohibited.
[2.4
CERAMIC GRANULES
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NOTE: Mineral granules may be embedded in wet
finish coat of silicone coatings. Mineral granule
surfacing is generally not required with urethane
coating but can be used if desired. Granules are
used to:
1. Improve impact resistance to foot traffic,
dropped tools, bird pecking, etc.;
2.
Improve fire resistance;
3. Improve appearance.
**************************************************************************
Aggregate surfacing shall be siliceous mineral granules, 98 percent passing
the No. 10 sieve and 98 percent retained on the No. 35 sieve. Granules
shall be free of fines and dust. One-color granule surfacing shall be used
and the granule color shall be compatible with the color of the topcoat.
Color of granules shall be as selected by the Contracting Officer from the
manufacturer's samples and descriptive literature.
]2.5
SEALANTS
Sealants shall be as recommended by the coating manufacturer.
SECTION 07570
Page 27
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